High Dynamic Range VLA Observations of the Gravitationally Lensed Quasar 0957+561

Details High Dynamic Range VLA Observations of the Gravitationally Lensed Quasar 0957+561 High Dynamic Range VLA Observations of the Gravitationally Lensed Quasar 0957+561

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.2240h&link_type=abstract

Astronomical Journal v.114, p.2240

Astronomy and Astrophysics

Astronomy

15

Radio Lines: Galaxies, Gravitational Lensing, Quasars: Individual: 0957+561

Scientific paper

We present 2, 3.6, 6, and 20 cm radio maps of the gravitationally leased quasar 0957+561 obtained with the VLA in A configuration. Besides the well-known jet and lobe structure associated with image A and the point sources associated with image B and the radio source G, the new 3.6 cm maps show interesting extensions of radio source G towards and away from B and the 20 cm map shows a large amount of extended structure, some of it not seen before. We argue that at least some of the 3.6 cm extensions of G are the radio jet associated with image B placing the caustic for multiple images outside the radio jet emitting region. The central portion of the extended 20 cm emission may be an "Einstein ring" produced by faint radio emission located at the caustic while the northern and southern portions of the extended 20 cm emission resemble the outer lobes of a faint "classical double" source with an axis nearly perpendicular to the axis of the jet and lobe emission associated with image A. If these outer "lobes" are second images of the lobes associated with image A then they are very difficult to understand theoretically. Most likely they are the radio lobes of the galaxy G1. Relative point source positions are presented and compared to published VLBI positions and recently obtained optical positions from HST confirming that the VLA source G is coincident (±0.02") with both the VLBI source G' and the nucleus of the leasing galaxy G 1. However, all or a portion of radio source G/G' may still be the elusive third image of the quasar rather than a radio source associated with galaxy G1. Fluxes, spectral indices and flux ratios are presented and compared to values found in the literature. A portion of the 20 cm extended emission occurs in a region where extended X-ray emission was reported to be detected by Einstein and ROSAT. However, a re-analysis of the ROSAT data shows little evidence for this emission.

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